Completing Ebola vaccine trials "a challenge" as epidemic wanes

April 10, 2015 1:26 PM

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GENEVA, April 10 (Reuters) - Falling Ebola cases in West Africa make completing big clinical trials on experimental vaccines a challenge, with the best hope resting on a study in Guinea, the World Health Organization said on Friday.

While the waning epidemic is good news for long-suffering populations in the region, it makes it harder for healthcare experts and drug companies to see if vaccines can protect people against the deadly fever.